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Nonionic additives to control puddling in inkjet inks

a technology of additives and inkjet inks, applied in the direction of inks, duplication/marking methods, printing, etc., can solve the problems of high print quality of currently produced inkjet inks, and inability to control so as to reduce the puddling of inkjet inks

Inactive Publication Date: 2005-02-08
HEWLETT PACKARD DEV CO LP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes a puddling additive used in inkjet ink to reduce puddling. The additive has a nonionic polar group attached to a C6-C30 hydrocarbon tail. The additive helps to prevent the ink from spreading or running after it is printed. The patent also describes a method of reducing puddling by adding the additive to the ink. The ink also contains a dye, an aqueous ink vehicle, and the puddling additive. The technical effect of this patent is to improve the quality and performance of inkjet ink by reducing puddling and improving the stability of the ink.

Problems solved by technology

In addition, since only the ink strikes the paper, the inkjet printer is fast and quiet.
Although inkjet inks are known to possess one or more of the foregoing properties, few inkjet inks possess all of these properties because an improvement in one property often negatively impacts another property.
While the overall print quality of currently produced inkjet inks is generally high, puddling of these inks still occurs on the orifice plate of the printhead.
Large puddles partially or completely block the orifices and cause missing nozzles, false low decap values, or changes in the trajectory of the ink drops.
The change in trajectory results in the ink drop not hitting its targeted pixel center, which creates printing errors on the media and reduces the quality of the printed image.
However, this modification to the printhead is costly.
However, adding salts or surfactants causes reliability and materials interaction issues because these additives cannot be used with all dyes or ink vehicles.
In addition, adding surfactants or salts negatively affects desirable properties of the inkjet inks.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

Inkjet Ink Compositions

Magenta inkjet inks including the components listed in Table 1 were produced. The dye used in these inkjet inks was a magenta dye available from Mitsubishi Chemical Corp. (Tokyo, Japan). The puddling additives that were used in the magenta inkjet inks are listed in Table 2, along with the amount of the puddling additive that was tested.

TABLE 2Puddling Results for Magenta Inkjet InksAmountPuddlingofscoreGeneralPuddling(lowerChemicalPuddlingadditivescoresCategoryadditive(wt %)Chemical Formulapreferred)AlcoholOleyl alcohol0.6C18H36O0Oleyl alcohol1.0C18H3600Polyethylene0.4C18H35(OCH2CH2)nOH, n is1.6(10) oleylapproximately 10etherPolyethylene0.4C18H35(OCH2CH2)nOH, n is2.2(2) oleylapproximately 20etherPolyethylene0.4C18H35(OCH2CH2)nOH, n is4.0(2) oleylapproximately 2etherAlkenestrans-5-0.6C10H200.3decenetrans-5-1.0C10H200.2decenetrans-4-0.4C8H161.1octenetrans-7-0.4C14H284.3tetradeceneZwitterioniccis-oleyl0.4R(CH3)2N+O−, R is oleyl0.4surfactantsdimethylamineoxidecis-...

example 2

Puddling Results

The inkjet inks described in Example 1 were tested to determine their puddling characteristics. The inkjet ink was printed continuously over a full sheet of print medium. To determine the extent of puddling, the inkjet pen was removed before it was serviced and the amount of puddling on the printhead was visually observed.

Puddling was measured by visually observing the printhead after printing and assigning a “puddling score” to reflect the extent of puddling of each inkjet ink. A low puddling score indicated a low amount of puddling. Inkjet inks having a puddling score less than approximately 1.0 exhibited the greatest decrease in puddling. Puddling in each inkjet ink having the puddling additive was compared to puddling of a control inkjet ink. A ratio of the puddling score of each inkjet ink having the puddling additive to the puddling score of the control inkjet ink is reported in Table 2 as the “% of no additive.”

As shown in Table 2, the inkjet inks comprising o...

example 3

Additional Puddling Additives

Puddling additives having an alkane, a polyethylene oxide, or an ether as the nonionic, polar group are synthesized or purchased. In addition, puddling additives having a hydrocarbon chain comprising 6, 7, 9, or 11-17 carbons in the C6-C30 hydrocarbon tail are synthesized or purchased. Puddling additives having a hydrocarbon chain comprising between 19 and 30 carbons in the C6-C30 hydrocarbon tail are also synthesized or purchased.

The puddling additives are formulated into inkjet inks and printed as previously described. Inkjet inks comprising these puddling additives exhibit reduced puddling.

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Abstract

A puddling additive comprising a nonionic, polar group and a C6-C30 hydrocarbon tail for use in reducing puddling in an inkjet ink. The inkjet ink also comprises a dye and an ink vehicle. A method of reducing puddling in an inkjet ink is also disclosed. The method comprises adding a puddling additive to the inkjet ink, wherein the puddling additive comprises a nonionic, polar group and a C6-C30 hydrocarbon tail.

Description

BACKGROUND OF THE INVENTION1. Field of the InventionThe present invention relates to an additive used to control puddling in inkjet inks. More specifically, the invention relates to a puddling additive having a nonionic, polar group and a C6-C30 hydrocarbon tail.2. State of the ArtInkjet printing is a popular alternative for home and office printing due to the low cost of inkjet printers, advances in quality of the printed images, and the relatively noise-free operation. Notwithstanding these advantages, research and development continue in order to improve inkjet print quality while maintaining a reasonable cost for the inkjet printer and the printing process.A conventional color inkjet printer comprises a plurality of resistor elements arranged in a particular pattern in a printhead. The resistor elements are located in a chamber that is provided with an opening for inkjet ink to enter from a reservoir. Together, the printhead and the reservoir comprise an inkjet pen. The printhea...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C09D11/00B41J2/01B41M5/00
CPCC09D11/40C09D11/38
Inventor UHLIR-TSANG, LINDA C.MOFFATT, JOHN R
Owner HEWLETT PACKARD DEV CO LP